4.3 with A/C
Problem serpentine belt squeal that refuses to go away.
What has been done so far.
Replaced the Alternator with new factory part due to dry bearings and a
bad regulator. Belt was chirping prior to this.
Two different new belts, One Gates and one Dayco
Replaced the upper idler with a spare.
Different tensioner and pulley.
AC compressor bearing is OK
Water pump seems OK, no leakage and the bearings feel tight with no play.
Power steering pump is also in good shape.
With it running you can apply pressure to the tensioner with NO change
in the squeal. Squeal goes away if you take tension off the belt so it
If you drip water on the BACK side of the belt with it running the
squeal stops for a few seconds but comes back. If you drip water on the
face of the belt there is no real change in the squeal.
Pulleys are in alignment and they are not worn to the point that the
belt drops into the pulley and bottoms out.
What else is left?
In the AM I plan on pulling the fan and W/P and bench testing it then
manually cleaning the belt path with solvent on the outside chance that
something like a silicone got in there.